A watt-hour (Wh) is the electrical energy delivered by one watt sustained for one hour.
Watt hours to Kilowatt hours
Convert Watt-hour (Wh) to Kilowatt-hour (kWh) instantly with an exact formula, conversion table, and FAQ.
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Convert watt-hours (Wh) to kilowatt-hours (kWh) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A kilowatt-hour (kWh) is the standard electricity-billing unit, equal to 1,000 watts sustained for one hour.
kWh = Wh × 0.001
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Formula
kWh = Wh × 0.001
Wh = kWh × 1000
Conversion table
| 1 Wh | 0.001 kWh |
| 5 Wh | 0.005 kWh |
| 10 Wh | 0.01 kWh |
| 20 Wh | 0.02 kWh |
| 50 Wh | 0.05 kWh |
| 100 Wh | 0.1 kWh |
| 500 Wh | 0.5 kWh |
| 1000 Wh | 1 kWh |
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How the formula works
Both watt-hour and kilowatt-hour measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in watt-hours by 0.001 to get kilowatt-hours. To reverse the conversion, multiply a kilowatt-hour value by 1000 to get back to watt-hours.
Frequently asked questions
What is Watt-hour (Wh)?
A watt-hour (Wh) is the electrical energy delivered by one watt sustained for one hour.
What is Kilowatt-hour (kWh)?
A kilowatt-hour (kWh) is the standard electricity-billing unit, equal to 1,000 watts sustained for one hour.
How do I convert watt-hours to kilowatt-hours?
Multiply the watt-hour value by 0.001 to get the equivalent in kilowatt-hours. For example, 5 Wh × 0.001 = 0.005 kWh.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 0.001 is an exact, non-rounded value.
Can I convert kilowatt-hours back to watt-hours?
Yes. Divide the kilowatt-hour value by 0.001, or multiply it by 1000, to get watt-hours.
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About converting watt-hours to kilowatt-hours
A watt-hour (Wh) is the electrical energy delivered by one watt sustained for one hour. A kilowatt-hour (kWh) is the standard electricity-billing unit, equal to 1,000 watts sustained for one hour.
Use this calculator to move between watt-hours and kilowatt-hours accurately for homework, engineering, billing, or everyday electricity calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.